L27 1992 no egr valve - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-11-2008, 06:56 PM   #1
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Default L27 1992 no egr valve

i see that 1992 L27 dont have an EGR valve

i read that this may possibly cause burnt valves, for some reason unknown/unexplained

is there any truth to this

and would removing the cat converter increase or decrease this possibility?

thanks!
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Old 01-11-2008, 07:59 PM   #2
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no they dont have one, thats correct.

its possible, but we've seen 92 L27s with just as high mileage as any other.

removing the catalytic converter is illegal. besides that, you'll lose considerable low end torque.
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Old 01-11-2008, 08:25 PM   #3
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i figured less restrictive exhaust would keep the exh valves a litttle cooler

due to more hot gases being able to escape quicker and easier

each has their own opinions however

i have had to remove many including on these particular cars due to them being plugged up and killing the engine

i removed the one on this 92 before it clogs up as do most at higher mileage such as this

ive probably removed upwards of around 50 or 60 or emore converters since about 1994

a large part due to failure or from cars to junk

we have no emissions equipment inspections or testing here, so we do whatever we want or have to

on anything

thanks for the info!
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Old 01-11-2008, 10:40 PM   #4
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Get a Magnaflow hi-flow unit. Cheap and effective.
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Old 01-11-2008, 11:27 PM   #5
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Quote:
Originally Posted by J Wikoff
Get a Magnaflow hi-flow unit. Cheap and effective.
I strongly second that. Rather than removing and not reinstalling.
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Old 01-13-2008, 05:50 AM   #6
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well i dont really care what your opinion is regarding cat removal, each has their own and will argue their point or belief for whatever reasons

ok, ok, i get it... youre a cat converter hugger.... congrats!
you win a cookie

i am not -on the other hand, nor are most people, especialyl after seeing os many fail and get plugged up and kill engines, especially at higher mileage(typically- but not always)

we have been doing it for years with never an ill effect, and we will continue doing so whenever needed

i just wanted to know more about the 1992 L27 not having an EGR - and anything further regarding the increased exh valve burning possibility that supposedly exists

in which is what this thread was started in RE of

thanks for any further on this, if anyone here knwos anything else about it, personal experience or known facts, etc.
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Old 01-13-2008, 11:35 AM   #7
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Keeping the cat is a federal law, and anyone that turns you in will get Two-fifty bucks. Didja know that? This is true regardless of whether or not you have inspections or emissions testing. I would suggest for your own wallet that you don't post claims like this in the future, particularly in light of the number of times you claim to have done it.

And the advice above is dead on. You will LOSE performance without a cat. Dozens of members here have experienced this effect, including the week I had one off while the new Cat was being shipped.

Yes, egr-less 92 L27'* are more prone to burnt valves simply because EGR valves actually reduce combustion temperatures by reducing the amount of oxygen in the combustion chamber before the spark.
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Old 01-13-2008, 04:52 PM   #8
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1992 SSE L27
1 exhaust valve after 216,000 miles, replaced the LIM while I was there.
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Old 01-13-2008, 04:54 PM   #9
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my 92 had 180k miles and no replacement on em.
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Old 01-26-2008, 05:04 AM   #10
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Default 1992 bonneville and no egr valve

I run mobil 1 synthetic oil in my Bonnie. I also changed out the thermostat to a 185-190 degree stat. I haven't had any problems with burnt valves.
The car has over 220,000 miles on it and is still kickin. I have replaced everything on the serpentine belt recently with exception of A/C compressor, everything else is new parts.
Since the 1992 has no egr valve, does that mean it doesn't have the problems with the UIM getting hot and becoming brittle. I've never had any problems with the UIM or LIM manifolds.

I love my 1992 Bonneville, it'* been the best GM car I've owned, it completely surprised me since I've never had any luck with GM products. I suspect some ex-ford engineers worked on this Pontiac design.

John
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